Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08777c1f90c6c36…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 07:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb1b0eec98d4ed1ace93399df68bc493 SHA-1: dc35cd9b90d19b31f5e75721adad82ed1732c18f SHA-256: a08777c1f90c6c368d693f310ce455f52be4feba4de2d969c483728de483587e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://indigobaby.eu/upload/files/zazanizugem.pdf In PDF document text
    • http://prodottoitalia.eu/userfiles/files/87059891088.pdfIn PDF document text
    • http://usagimatur.com/files/others/43306828687.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xajovivosugiwunim.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/wanekaxitibadatavafaz.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/pewofiwadepegotusaxol.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0e2b937c---89060090544.pdfIn PDF document text
    • https://adikketiga.com/contents/files/defamonuvujeterujuze.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/23363707222.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2ca77dbd4e54814e8957b09179a94339/ponorowemef.pdfIn PDF document text
    • https://chineseclothingonline.com/File/36080890675.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210912_256FF8042B80C654.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/lufigajuzuk.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/51179557183.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/76004160845.pdfIn PDF document text
    • https://red-adlay.com/upload/files/24819795844.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/12/xopiwodozi.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/40210452517.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/dekeniko.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210911084637.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/ganetuwurixosunav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=msg+go+on+firestickPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 10388 bytes
SHA-256: 05d44591859523b92f5cab282cbc73980d756aaa2e71e90ede3608577bb4fe24
font_02_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 18236 bytes
SHA-256: 901675ced8a04ccf0e6bd528ffaf06aa9c3664f0b6a0ff6bc2d6a71c3b91665f

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